Efficient halogen-free intumescent flame-retardant glass fiber reinforced polypropylene material and preparation method thereof

Abstract

The invention discloses an efficient halogen-free intumescent flame-retardant glass fiber reinforced polypropylene material. The raw materials comprise the following components in percentage by weight: 39-75 parts of polypropylene, 0-10 parts of coated ammonium polyphosphate, 1-15 parts of melamine and derivatives thereof, 1-15 parts of a halogen-free flame-retardant charring agent, 0-5 parts of aflame-retardant synergist, 5-30 parts of glass fibers subjected to surface treatment, 0.03-3 parts of a coupling agent, 0.5-8 parts of a compatilizer, 0-20 parts of a toughening agent, 0.1-1 part ofa lubricant and 0.01-4 parts of an antioxidant. The polypropylene material has the advantages of better flame retardancy, more outstanding water resistance and mechanical properties, the realization of the balance among processability, rigidity and toughness, lower dimensional shrinkage rate, the realization of very good rigidity and toughness balance and low shrinkage rate, no warping of a product, no floating fibers on a surface, and the enlargement of the application range of the polypropylene material.

Description

technical field [0001] The invention relates to a polypropylene material, in particular to a high-efficiency halogen-free expansion type flame-retardant glass fiber reinforced polypropylene material and a preparation method thereof. Background technique [0002] As a general polymer material, polypropylene (PP) has excellent mechanical properties, electrical insulation properties, chemical corrosion resistance, heat resistance and recyclability, so it is widely used in electronics, electrical appliances, automobiles, ships, Construction, packaging and other fields. In practical applications, due to the large molding shrinkage of PP products, it is difficult to guarantee the dimensional stability, the sensitivity to the notch is high, and the impact resistance is low. The use of glass fiber (GF) reinforcement is an important measure to improve the mechanical properties, heat resistance and dimensional stability of PP. At the same time, due to the low limiting oxygen index o...

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Problems solved by technology

The combination of metal hydroxide and resin is poor, and the addition amount is high, which leads to the reduction of the comprehensive performance of the polymer, which is not conducive to the processing of the polymer; red phosphorus is easy to absorb moisture, oxidize, and emit highly toxic gas, and the dust is easy to explode, showing dark red , so the use is greatly restricted; and the cost of silicone-based flame retardants is relatively high

Application No. 201110387491.6 discloses a halogen-free intumescent flame-retardant glass fiber reinforced polypropylene material and its preparation method. Although the polypropylene material has good flame retardancy and excellent mechanical properties, it does not contain toxic halogens during use. Gas release, but the mechanical properties of the polypropylene material are not high enough, the addition of its halogen-free intumescent flame retardant has a certain impact on the mechanical properties of the polypropylene material, that is to say, to improve the flame retardant effect, it is necessary to increase the non-halogenated flame retardant The amount of halogen-free intumescent flame retardant, and the amount of halogen-free intumescent flame retardant will affect the mechanical properties of polypropylene material, resulting in a decrease in mechanical properties, and the water resistance of the polypropylene material is not ideal

In addition, since polypropylene is a crystalline material, its molding shrinkage rate is relatively large (1.5% to 2.5%)

Its application is limited in some precision parts that require low shrinkage of the material and no defects in the appearance of the molding.

Although the shrinkage of polypropylene can be reduced by glass fiber and mineral filling, usually due to the anisotropy of glass fiber and mineral materials in the horizontal direction of flow and the vertical direction of flow, the molding shrinkage of polypropylene materials in the horizontal direction of flow (δ1 value ) and the molding shrinkage rate (δ2 value) in the vertical direction still have a large difference (>0.5), so that the modified polypropylene material cannot shrink at the same time due to the large gap between δ1 and δ2 values. Therefore, , the polypropylene material with application number 201110387491.6 still has the problem of unsatisfactory warpage deformation rate, which leads to unsatisfactory processing and forming performance

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